linux-ext4 - Re: Ext4 on SSD Intel X25-M

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Message-ID: <4B01A157.8080900@diamondcut.com.br>
Date:	Mon, 16 Nov 2009 17:00:39 -0200
From:	"Renato S. Yamane" <yamane@...mondcut.com.br>
To:	linux-ext4@...r.kernel.org
CC:	Theodore Tso <tytso@....edu>, Eric Sandeen <sandeen@...hat.com>,
	Florian Weimer <fw@...eb.enyo.de>
Subject: Re: Ext4 on SSD Intel X25-M

On 16-11-2009 16:40, Theodore Tso wrote:
> Theodore Tso wrote:
>> If you've only had the disk for a short while, then the initial writes
>> to install your system is probably biasing your results.  So far you
>> have approximately 19GB of disk writes.  I'm guessing that at least
>> 3-4GB is from the initial installation of software on your system.
>
> I just did a default Ubuntu Karmic x86_64 install, and it writes a
> approximately ten and a half GB to the root partition.  It also (for
> no explicable reason) apparently zero's out the swap partition, which
> (a) takes a long time, and (b) results in useless, pointless writes to
> the SSD.  Someone should complain to Ubuntu about that...  the
> workaround is to not configure swap during the Ubuntu install process,
> and to manually configure it yourself later.
>
> (Or to not use swap at all, if you have enough memory in your system.)
>
> In any case, given that means that only 8.5GB worth of data was
> written to your system, so over 30 days, your usage levels is
> averaging to 0.283 GB per calendar day.

I'm working with my laptop by 9h right now (this is my tipical business 
day) and /sys/fs/ext4/sda1/session_write_kbytes show me "324732"

So, I think that you is really right.

Renato S. Yamane
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